0001391127-20-000242 | 10-Q | XBRL Viewer

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Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2020	Oct. 15, 2020
Cover [Abstract]
Document Type	10-Q
Document Period End Date	Sep. 30, 2020
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-33508
Entity Registrant Name	Limelight Networks, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-1677033
Entity Central Index Key	0001391127
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Address, Address Line One	1465 North Scottsdale Road
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Scottsdale
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85257
City Area Code	602
Local Phone Number	850-5000
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	LLNW
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		122,973,706

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 75,169	$ 18,335
Marketable securities	49,623	0
Accounts receivable, net	42,222	34,476
Income taxes receivable	81	82
Prepaid expenses and other current assets	12,561	9,920
Total current assets	179,656	62,813
Property and equipment, net	47,493	46,136
Operating lease right of use assets	10,844	12,842
Marketable securities, less current portion	40	40
Deferred income taxes	1,428	1,319
Goodwill	77,126	77,102
Other assets	7,459	9,117
Total assets	324,046	209,369
Current liabilities:
Accounts payable	12,437	12,020
Deferred revenue	797	976
Operating lease liability obligations	2,654	2,056
Income taxes payable	153	178
Other current liabilities	17,584	13,398
Total current liabilities	33,625	28,628
Convertible senior notes, net	99,937	0
Operating lease liability obligations, less current portion	11,745	13,488
Deferred income taxes	251	239
Deferred revenue, less current portion	230	161
Other long-term liabilities	579	316
Total liabilities	146,367	42,832
Commitments and contingencies
Stockholders’ equity:
Convertible preferred stock, $0.001 par value; 7,500 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.001 par value; 300,000 shares authorized; 122,824 and 118,368 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	123	118
Additional paid-in capital	552,559	530,285
Accumulated other comprehensive loss	(9,379)	(9,210)
Accumulated deficit	(365,624)	(354,656)
Total stockholders’ equity	177,679	166,537
Total liabilities and stockholders’ equity	$ 324,046	$ 209,369

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized	7,500,000	7,500,000
Convertible preferred stock, shares issued	0	0
Convertible preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	122,824,000	118,368,000
Common stock, shares outstanding	122,824,000	118,368,000

Unaudited Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 59,243	$ 51,321	$ 174,801	$ 140,505
Cost of revenue:
Cost of services	31,905	25,602	92,406	71,311
Depreciation — network	5,602	4,961	16,112	13,905
Total cost of revenue	37,507	30,563	108,518	85,216
Gross profit	21,736	20,758	66,283	55,289
Operating expenses:
General and administrative	7,751	7,356	23,820	23,231
Sales and marketing	10,456	10,713	33,279	32,679
Research and development	5,425	5,160	16,614	17,075
Depreciation and amortization	384	172	1,049	545
Total operating expenses	24,016	23,401	74,762	73,530
Operating loss	(2,280)	(2,643)	(8,479)	(18,241)
Other income (expense):
Interest expense	(1,674)	(10)	(1,756)	(30)
Interest income	10	81	40	402
Other, net	25	(13)	(396)	(89)
Total other (expense) income	(1,639)	58	(2,112)	283
Loss before income taxes	(3,919)	(2,585)	(10,591)	(17,958)
Income tax expense	66	166	377	544
Net loss	$ (3,985)	$ (2,751)	$ (10,968)	$ (18,502)
Net loss per share:
Basic (in dollars per share)	$ (0.03)	$ (0.02)	$ (0.09)	$ (0.16)
Diluted (in dollars per share)	$ (0.03)	$ (0.02)	$ (0.09)	$ (0.16)
Weighted average shares used in per share calculation:
Basic (shares)	122,363	116,270	120,519	115,318
Diluted (shares)	122,363	116,270	120,519	115,318

Unaudited Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (3,985)	$ (2,751)	$ (10,968)	$ (18,502)
Other comprehensive income (loss), net of tax:
Unrealized (loss) gain on investments	(80)	2	(80)	39
Foreign currency translation gain (loss)	732	(357)	(89)	157
Other comprehensive income (loss)	652	(355)	(169)	196
Comprehensive loss	$ (3,333)	$ (3,106)	$ (11,137)	$ (18,306)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Unaudited Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance, shares at Dec. 31, 2018		114,246,000
Beginning balance at Dec. 31, 2018	$ 165,151	$ 114	$ 513,682	$ (10,033)	$ (338,612)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(18,502)				(18,502)
Change in unrealized loss on available-for-sale investments, net of taxes	39			39
Foreign currency translation adjustment, net of taxes	157			157
Exercise of common stock options, shares		10,000
Exercise of common stock options	21		21
Vesting of restricted stock units, shares		2,695,000
Vesting of restricted stock units	0	$ 3	(3)
Restricted stock units surrendered in lieu of withholding taxes, shares		(887,000)
Restricted stock units surrendered in lieu of withholding taxes	(2,528)		(2,528)
Issuance of common stock under employee stock purchase plan, shares		449,000
Issuance of common stock under employee stock purchase plan	1,095		1,095
Share-based compensation	12,491		12,491
Ending balance, shares at Sep. 30, 2019		116,513,000
Ending balance at Sep. 30, 2019	157,924	$ 117	524,758	(9,837)	(357,114)
Beginning balance, shares at Jun. 30, 2019		115,760,000
Beginning balance at Jun. 30, 2019	156,646	$ 116	520,375	(9,482)	(354,363)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(2,751)				(2,751)
Change in unrealized loss on available-for-sale investments, net of taxes	2			2
Foreign currency translation adjustment, net of taxes	(357)			(357)
Exercise of common stock options, shares		5,000
Exercise of common stock options	13		13
Vesting of restricted stock units, shares		1,129,000
Vesting of restricted stock units	0	$ 1	(1)
Restricted stock units surrendered in lieu of withholding taxes, shares		(381,000)
Restricted stock units surrendered in lieu of withholding taxes	(1,015)		(1,015)
Share-based compensation	5,386		5,386
Ending balance, shares at Sep. 30, 2019		116,513,000
Ending balance at Sep. 30, 2019	$ 157,924	$ 117	524,758	(9,837)	(357,114)
Beginning balance, shares at Dec. 31, 2019	118,368,000	118,368,000
Beginning balance at Dec. 31, 2019	$ 166,537	$ 118	530,285	(9,210)	(354,656)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(10,968)				(10,968)
Change in unrealized loss on available-for-sale investments, net of taxes	(80)			(80)
Foreign currency translation adjustment, net of taxes	(89)			(89)
Exercise of common stock options, shares		2,672,000
Exercise of common stock options	7,610	$ 3	7,607
Vesting of restricted stock units, shares		2,233,000
Vesting of restricted stock units	7	$ 2	5
Restricted stock units surrendered in lieu of withholding taxes, shares		(749,000)
Restricted stock units surrendered in lieu of withholding taxes	(3,986)		(3,986)
Issuance of common stock under employee stock purchase plan, shares		300,000
Issuance of common stock under employee stock purchase plan	1,074		1,074
Share-based compensation	12,240		12,240
Equity component of convertible senior notes, net	21,747		21,747
Purchase of capped calls related to issuance of convertible senior notes	$ (16,413)		(16,413)
Ending balance, shares at Sep. 30, 2020	122,824,000	122,824,000
Ending balance at Sep. 30, 2020	$ 177,679	$ 123	552,559	(9,379)	(365,624)
Beginning balance, shares at Jun. 30, 2020		121,692,000
Beginning balance at Jun. 30, 2020	169,815	$ 122	541,363	(10,031)	(361,639)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,985)				(3,985)
Change in unrealized loss on available-for-sale investments, net of taxes	(80)			(80)
Foreign currency translation adjustment, net of taxes	732			732
Exercise of common stock options, shares		812,000
Exercise of common stock options	2,599	$ 1	2,598
Vesting of restricted stock units, shares		488,000
Vesting of restricted stock units	0
Restricted stock units surrendered in lieu of withholding taxes, shares		(168,000)
Restricted stock units surrendered in lieu of withholding taxes	(1,041)		(1,041)
Share-based compensation	4,305		4,305
Equity component of convertible senior notes, net	21,747		21,747
Purchase of capped calls related to issuance of convertible senior notes	$ (16,413)		(16,413)
Ending balance, shares at Sep. 30, 2020	122,824,000	122,824,000
Ending balance at Sep. 30, 2020	$ 177,679	$ 123	$ 552,559	$ (9,379)	$ (365,624)

Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities
Net loss	$ (10,968)	$ (18,502)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	17,161	14,450
Share-based compensation	12,238	10,463
Foreign currency remeasurement gain	(113)	(104)
Deferred income taxes	(80)	(30)
Gain on sale of property and equipment	(1)	(56)
Accounts receivable charges	476	1,274
Amortization of premium on marketable securities	87	29
Noncash interest expense	868	0
Changes in operating assets and liabilities:
Accounts receivable	(8,221)	(11,051)
Prepaid expenses and other current assets	(2,679)	(777)
Income taxes receivable	3	43
Other assets	2,504	(2,641)
Accounts payable and other current liabilities	8,159	3,675
Deferred revenue	(109)	(557)
Income taxes payable	(15)	204
Payments related to litigation, net	0	(3,040)
Other long term liabilities	265	(137)
Net cash provided by (used in) operating activities	19,575	(6,757)
Investing activities
Purchases of marketable securities	(52,690)	(10,279)
Sale and maturities of marketable securities	2,900	32,153
Purchases of property and equipment	(22,128)	(24,224)
Proceeds from sale of property and equipment	1	51
Net cash used in investing activities	(71,917)	(2,299)
Financing activities
Proceeds from issuance of debt, net	121,600	0
Purchase of capped calls	(16,413)	0
Payment of debt issuance costs	(784)	0
Payments of employee tax withholdings related to restricted stock vesting	(3,987)	(2,528)
Proceeds from employee stock plans	8,691	1,116
Net cash provided by (used in) financing activities	109,107	(1,412)
Effect of exchange rate changes on cash and cash equivalents	69	(83)
Net increase (decrease) in cash and cash equivalents	56,834	(10,551)
Cash and cash equivalents, beginning of period	18,335	25,383
Cash and cash equivalents, end of period	75,169	14,832
Supplemental disclosure of cash flow information
Cash paid during the period for interest	97	30
Cash paid during the period for income taxes, net of refunds	$ 452	$ 340

Nature of Business	9 Months Ended
Nature of Business	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Nature of Business Limelight Networks Inc., a provider of digital content delivery, online video delivery, cloud security, edge computing and cloud storage services, empowers customers to provide exceptional digital experiences. Limelight’s edge services platform includes a globally distributed, high performance private network, intelligent software, and expert support services that enable current and future workflows. We were incorporated in Delaware in 2003, and have operated in the Phoenix metropolitan area since 2001 and elsewhere throughout the United States since 2003. We began international operations in 2004.

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC. They do not include all of the information and footnotes required by U.S. generally accepted accounting principles (U.S. GAAP) for complete financial statements. Such interim financial information is unaudited but reflects all adjustments that are, in the opinion of management, necessary for the fair presentation of the interim periods presented and of a normal recurring nature. This quarterly report on Form 10-Q should be read in conjunction with our audited financial statements and footnotes included in our annual report on Form 10-K for the fiscal year ended December 31, 2019. All information is presented in thousands, except per share amounts and where specifically noted. The consolidated financial statements include accounts of Limelight and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated. In addition, certain other reclassifications have been made to prior year amounts to conform to the current year presentation. Use of Estimates The preparation of the consolidated financial statements and related disclosures in conformity with U.S. GAAP requires management to make judgments, assumptions, and estimates that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results and outcomes may differ from those estimates. The results of operations presented in this quarterly report on Form 10-Q are not necessarily indicative of the results that may be expected for the year ending December 31, 2020, or for any future periods. Recent Accounting Standards Adopted Accounting Standards In June 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-13, which requires measurement and recognition of expected credit losses for financial assets held. The standard is to be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. We adopted this guidance effective January 1, 2020. The adoption of this guidance did not have a material impact on our consolidated financial statements and related disclosures and there was no cumulative-effect adjustment required. In January 2017, the FASB issued ASU 2017-04, which simplifies the accounting for goodwill impairment. The updated guidance eliminates Step 2 of the impairment test, which requires entities to calculate the implied fair value of goodwill to measure a goodwill impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value, determined in Step 1. We adopted this guidance effective January 1, 2020, using a prospective approach. The adoption of this guidance did not have a material impact on our consolidated financial statements and related disclosures. In August 2018, the FASB issued ASU 2018-13, which removes, modifies and adds to the disclosure requirements on fair value measurements in Topic 820. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. An entity is permitted to early adopt any removed or modified disclosures upon issuance of this updated guidance and delay adoption of the additional disclosures until their effective date. We adopted this guidance effective January 1, 2020. The adoption of this guidance did not have a material impact on our consolidated financial statements and related disclosures. In August 2018, the FASB issued ASU 2018-15, to help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement (hosting arrangement) by providing guidance for determining when the arrangement includes a software license. The amendments align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments. We adopted this guidance effective January 1, 2020. The adoption of this guidance did not have a material impact on our consolidated financial statements and related disclosures. Recently Issued Accounting Standards In December 2019, the FASB issued ASU 2019-12 to simplifying the accounting for income taxes. ASU 2019-12 is intended to simplify various aspects related to accounting for income taxes, eliminates certain exceptions to the general principles in the Accounting Standards Codification (ASC) Topic 740 related to intra-period tax allocation, simplifies when companies recognize deferred taxes in an interim period, and clarifies certain aspects of the current guidance to promote consistent application. This guidance is effective for public business entities for fiscal years beginning after December 15, 2020, and for interim periods within those fiscal years, with early adoption permitted. ASU 2019-12 requires a retrospective, modified retrospective or prospective transition approach for individual aspects of the ASU. This guidance is applicable to us for our fiscal year beginning January 1, 2021. We are currently evaluating the potential impact of this guidance on our consolidated financial statements. In August 2020, the FASB issued ASU 2020-06, which simplifies the accounting for convertible instruments. ASU 2020-06 eliminates certain models that require separate accounting for embedded conversion features, in certain cases. Additionally, among other changes, the guidance eliminates certain of the conditions for equity classification for contracts in an entity’s own equity. ASU 2020-06 also requires entities to use the if-converted method for all convertible instruments in the diluted earnings per share calculation and include the effect of share settlement for instruments that may be settled in cash or shares, except for certain liability-classified share-based payment awards. ASU 2020-06 is effective for our fiscal year beginning after December 15, 2021, including interim periods within this fiscal year. Early adoption is permitted, but no earlier than our fiscal year beginning after December 15, 2020, including interim periods within those fiscal years. This guidance can be applied using either a modified or full retrospective approach. We expect to early adopt this guidance, however at this time we are currently evaluating the impact this guidance will have on our consolidated financial statements. Significant Accounting Policies There have been no changes in the significant accounting policies from those that were disclosed in our Annual Report, except for convertible senior notes as described below: Convertible Senior Notes In July 2020, we issued $125,000 aggregate principal amount of 3.50% convertible senior notes. We separate our convertible senior notes (the Notes) into liability and equity components. The carrying amount of the liability component is calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option is determined by deducting the fair value of the liability component from the principal amount of the Notes. The excess of the principal amount of the Notes over the carrying amount of the liability component (debt discount) is amortized to interest expense at an effective interest rate over the contractual term of the Notes. The equity component is recorded in additional paid-in capital and is not remeasured as long as it continues to meet the conditions for equity classification. We allocate the issuance costs to the liability and equity components of the Notes based on the proportion of the proceeds allocated to the debt and equity components. Issuance costs attributable to the liability component are amortized to interest expense using the effective interest method over the contractual terms of the Notes. Issuance costs attributable to the equity component are netted with the equity component in stockholders’ equity. Revenue Recognition Revenues are recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. For contracts that contain minimum commitments over the contractual term, we estimate an amount of variable consideration by using either the expected value method or the most likely amount method. We include estimates of variable consideration in revenue only when we have a high degree of confidence that revenue will not be reversed in a subsequent reporting period. We believe that the expected value method is the most appropriate estimate of the amount of variable consideration. These customers have entered into contracts with contract terms generally from one to four years. As of September 30, 2020, we have approximately $3,641 of remaining unsatisfied performance obligations. We recognized revenue of approximately $1,911 and $2,200, respectively, during the three months ended September 30, 2020 and 2019, related to these types of contracts with our customers. During the nine months ended September 30, 2020 and 2019, we recognized approximately $6,008 and $7,400, respectively. We expect to recognize approximately 37% of the remaining unsatisfied performance obligations in 2020, approximately 57% in 2021, and approximately 6% in 2022.

Investments in Marketable Securities

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Investments in Marketable Securities

The following is a summary of marketable securities (designated as available-for-sale) at September 30, 2020.


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Certificate of deposit	$	40	$	—	$	—	$	40
Corporate notes and bonds	46,705		—		78		46,627
Municipal securities	2,997		1		2		2,996
Total marketable securities	$	49,742	$	1	$	80	$	49,663

The amortized cost and estimated fair value of marketable securities at September 30, 2020, by maturity are shown below:


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available-for-sale securities:
Due in one year or less	$	42,175	$	1	$	69	$	42,107
Due after one year and through five years	7,567		—		11		7,556
Total marketable securities	$	49,742	$	1	$	80	$	49,663

The following is a summary of marketable securities (designated as available-for-sale) at December 31, 2019.


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Certificate of deposit	$	40	$	—	$	—	$	40

The amortized cost and estimated fair value of marketable securities at December 31, 2019, by maturity are shown below:


	Amortized Cost	Gross Unrealized Gains	Gross Unrealized Losses	Estimated Fair Value
Available-for-sale securities:

Due after one year and through five years	40	—	—	40

Accounts Receivable, net

9 Months Ended

Sep. 30, 2020

Receivables [Abstract]

Accounts Receivable, net

Accounts receivable, net include:


	September 30,		December 31,
	2020		2019
Accounts receivable	$	43,306	$	35,619
Less: credit allowance	(200)		(170)
Less: allowance for doubtful accounts	(884)		(973)
Total accounts receivable, net	$	42,222	$	34,476

All trade receivables are reported on the Consolidated Balance Sheets at their amortized cost adjusted for any write-offs and net of allowances for credit losses. We maintain an allowance for credit losses, which represents an estimate of expected losses of our receivables considering current market conditions and estimates for supportable forecasts when appropriate. The estimate is a result of our ongoing assessments and evaluations of collectability, historical loss experience, and future expectations in estimating credit losses for our trade receivables. For trade receivables, we apply a reserve percentage to the specific age of the receivable to estimate the allowance for doubtful accounts. The reserve percentages are determined based on our historical write-off experience. Determination of the proper amount of allowance requires management to exercise judgment about the timing, frequency and severity of potential credit losses that could materially affect the provision for credit losses and, as a result, net earnings. The allowance takes into consideration numerous quantitative and qualitative factors that include receivable type, historical loss experience, delinquency trends, collection experience, current economic conditions, estimates for supportable forecasts, when appropriate, and credit risk characteristics.

We evaluate the credit risk of the customer when extending credit based on a combination of various financial and qualitative factors that may affect our customers’ ability to pay. These factors may include the customer’s financial condition, past payment experience, and credit bureau information.

The following is a roll-forward of the allowances for doubtful accounts related to trade accounts receivable for the nine months ended September 30, 2020:


			Nine Months Ended
			September 30, 2020
Beginning of period			973
Provision for credit losses			476
Write-offs			(565)
End of period			884

Prepaid Expenses and Other Current Assets

9 Months Ended

Sep. 30, 2020

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets include:


	September 30,		December 31,
	2020		2019
Prepaid bandwidth and backbone	1,324		1,717
VAT receivable	3,877		3,068
Prepaid expenses and insurance	2,731		1,685
Vendor deposits and other	4,629		3,450
Total prepaid expenses and other current assets	$	12,561	$	9,920

Property and Equipment, net

9 Months Ended

Sep. 30, 2020

Property, Plant and Equipment [Abstract]

Property and Equipment, net

Property and equipment, net include:


	September 30,		December 31,
	2020		2019
Network equipment	$	134,082	$	126,975
Computer equipment and software	7,293		7,603
Furniture and fixtures	1,785		1,906
Leasehold improvements	7,455		7,888
Other equipment	21		54
Total property and equipment	150,636		144,426
Less: accumulated depreciation	(103,143)		(98,290)
Total property and equipment, net	$	47,493	$	46,136

Cost of revenue depreciation expense related to property and equipment was approximately $5,602 and $4,961, respectively, for the three months ended September 30, 2020 and 2019, respectively. For the nine months ended September 30, 2020 and 2019, respectively, cost of revenue depreciation expense related to property and equipment was approximately $16,112 and $13,905, respectively.

Operating expense depreciation and amortization expense related to property and equipment was approximately $384 and $172, respectively, for the three months ended September 30, 2020 and 2019, respectively. For the nine months ended September 30, 2020 and 2019, respectively, operating expense depreciation and amortization expense related to property and equipment was approximately $1,049 and $545, respectively.

Other Current Liabilities

9 Months Ended

Sep. 30, 2020

Other Liabilities Disclosure [Abstract]

Other Current Liabilities

Other current liabilities include:


	September 30,		December 31,
	2020		2019
Accrued compensation and benefits	$	8,565	$	4,918
Accrued cost of revenue	5,104		4,176
Accrued interest payable	791		—
Other accrued expenses	3,124		4,304
Total other current liabilities	$	17,584	$	13,398

Debt

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Debt

Convertible Senior Notes - Due 2025

On July 27, 2020, we issued $125,000 aggregate principal amount of 3.50% Convertible Senior Notes due 2025 (the Notes), including the initial purchasers’ exercise in full of their option to purchase an additional $15,000 principal amount of the Notes, in a private placement to qualified institutional buyers in an offering exempt from registration under the Securities Act of 1933, as amended. The net proceeds from the issuance of the Notes was $120,816 after deducting transaction costs.

The Notes are governed by an indenture (the Indenture) between us, as the issuer, and U.S. Bank, National Association, as trustee. The Notes are senior, unsecured obligations of ours and will be equal in right of payment with our senior, unsecured indebtedness; senior in right of payment to our indebtedness that is expressly subordinated to the notes; effectively subordinated to our senior, secured indebtedness, including future borrowings, if any, under our $20,000 credit facility with SVB, to the extent of the value of the collateral securing that indebtedness; and structurally subordinated to all indebtedness and other liabilities, including trade payables, and (to the extent we are not a holder thereof) preferred equity, if any, of our subsidiaries. The Indenture includes customary covenants and sets forth certain events of default after which the Notes may be declared immediately due and payable and sets forth certain types of bankruptcy or insolvency events of default involving us after which the Notes become automatically due and payable.

The Notes mature on August 1, 2025 unless earlier converted, redeemed or repurchased in accordance with their term prior to the maturity date. Interest is payable semiannually in arrears on February 1 and August 1 of each year, beginning on

February 1, 2021. The holders of the Notes may convert all or any portion of their Notes at their option only in the following circumstances:

(1) during any calendar quarter commencing after the calendar quarter ending on December 31, 2020 (and only during such calendar quarter), if the last reported sale price per share of our common stock exceeds 130% of the conversion price of $8.53 for each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter;

(2) during the five consecutive business days immediately after any ten consecutive trading day period (such ten consecutive trading day period, the “measurement period”) in which the trading price per $1 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of our common stock on such trading day and the conversion rate on such trading day;

(3) upon the occurrence of certain corporate events or distributions of our common stock;

(4) if we call such Notes for redemption; and

(5) at any time from, and including, May 1, 2025, until the close of business on the second scheduled trading day immediately before the maturity date.

On or after May 1, 2025, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their Notes, in minimum principal amount denominations of $1 or any integral multiple of $1 in excess thereof, at the option of the holder regardless of the foregoing circumstances. Upon conversion, we may satisfy our conversion obligation by paying or delivering, as applicable, cash, shares of common stock or a combination of cash and shares of common stock, at our election, in the manner and subject to the terms and conditions provided in the Indenture. The Notes have an initial conversion rate of 117.2367 shares of our common stock per $1 principal amount of Notes, which is equal to an initial conversion price of approximately $8.53 per share of our common stock. The initial conversion price of the notes represents a premium of approximately 27.5% over the last reported sale price of our common stock on The Nasdaq Global Select Market of $6.69 per share on July 22, 2020. The conversion rate is subject to adjustment under certain circumstances in accordance with the terms of the Indenture. In addition, following certain corporate events that occur prior to the maturity date or if we deliver a notice of redemption, we will increase the conversion rate in certain circumstances for a holder who elects to convert its Notes in connection with such a corporate event or convert its Notes called (or deemed called) for redemption in connection with such notice of redemption, provided that the conversion rate will not exceed 149.4768 share of our common stock per $1 principal amount of Notes, subject to adjustment.

We may not redeem the Notes prior to August 4, 2023. We may redeem for cash all, or any portion in an authorized denomination, of the Notes, at our option, on or after August 4, 2023, and on or prior to the 41st scheduled trading day immediately preceding the maturity date, if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days, whether or not consecutive, including the trading day immediately preceding the date on which we provide notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day preceding the date on which we provide notice of redemption at a redemption price equal to 100% of the principal amount of the Notes to be redeemed, plus any accrued and unpaid interest to, but excluding, the redemption date. No sinking fund is provided for the Notes, which means that we are not required to redeem or retire the Notes periodically.

If we undergo a fundamental change (as defined in the Indenture), holders may require us to repurchase for cash all or any portion of their Notes at a fundamental change repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

During the three months ended September 30, 2020, the conditions allowing holders of the Notes to convert were not met and therefore the Notes are not yet convertible. The liability component of the Notes is classified as long-term debt on our condensed consolidated balance sheet as of September 30, 2020.

We separately accounted for the liability and equity components of the Notes. We determined the initial carrying amount of the $102,500 liability component before consideration of debt discount and transaction fees by calculating the present value of the cash flows using an effective interest rate of 8.6%. The interest rate was determined based on non-convertible debt offerings of similar sizes and terms by companies with similar credit ratings (Level 2 inputs). The carrying amount of the equity component, representing the conversion option, was $22,500 and was calculated by deducting the initial carrying value of the liability component from the principal amount of the Notes as a whole. This difference represents a debt discount that is amortized to interest expense over the 5-year contractual term of the Notes using the effective interest rate method. The equity component is not remeasured as long as it continues to meet the conditions for equity classification.

We allocated transaction costs related to the issuance of the Notes to the liability and equity components using the same proportions as the initial carrying value of the Notes. Transaction costs initially attributable to the liability component were $3,400 and are being amortized to interest expense using the effective interest method over the term of the Notes. Transaction costs attributable to the equity component were $800 and are accounted for consistently with the equity component of the debt.

The net carrying amount of the liability and equity components of the Notes was as follows:


	September 30,
	2020
Liability component:
Principal	$	125,000
Debt discount (equity component)	(21,747)
Unamortized transaction costs	(3,316)
Net carrying amount	$	99,937

Equity component, net of transaction costs	$	21,747

Interest expense recognized related to the Notes was as follows:


	Three and Nine Months
	Ended September 30, 2020
Contractual interest expense	$	791
Amortization of debt discount	753
Amortization of transaction costs	115
Total	$	1,659

As of September 30, 2020, the estimated fair value of the Notes was $129,741. We estimated the fair value based on the quoted market prices in an inactive market on the last trading day of the reporting period, which are considered Level 2 inputs.

Capped Call Transactions

In connection with the offering of the Notes, we entered into privately negotiated capped call transactions with certain counterparties (collectively, the Capped Calls). The Capped Calls have an initial strike price of approximately $8.53 per share, subject to certain adjustments, which corresponds to the initial conversion price of the Notes. The Capped Calls have an initial cap price of $13.38 per share, subject to certain adjustments. The Capped Calls are generally intended to reduce or offset the potential economic dilution of approximately 14.7 million shares to our common stock upon any conversion of the Notes with such reduction or offset, as the case may be, subject to a cap based on the cap price. As the Capped Calls are considered indexed to our own stock and are equity classified, they are recorded in stockholders’ equity and are not accounted for as derivatives. The cost of $16,400 incurred in connection with the Capped Calls was recorded as a reduction to additional paid-in capital.

Convertible Senior Notes and Capped Calls – Impact on Earnings per Share

The 14.7 million shares underlying the conversion option of the Notes will not have an impact on our diluted earnings per share until the average market price of our common stock exceeds the conversion price of $8.53 per share, as we intend and expect to have the ability to settle the principal amount of the Notes in cash upon conversion. Under current accounting guidance we do not have sufficient substance to overcome the presumption of stock settlement at this time and would be required to calculate earnings per share under the "if converted" method. However, we are in a loss position and therefore, the effects of the Notes are anti-dilutive. Once we achieve net income, we will re-evaluate our intent and ability to settle the Notes in cash and will apply the appropriate earnings per share calculation method at that time.

Line of Credit

In July 2020, we entered into a Sixth Amendment (Sixth Amendment) to the Loan and Security Agreement (the Credit Agreement) with Silicon Valley Bank (SVB) originally entered into in November 2015. Under the Sixth Amendment, the maximum principal commitment amount remained at $20,000. In addition, the Sixth Amendment modified language within the

Credit Agreement, which permitted us to issue our Notes. Our borrowing capacity is the lesser of the commitment amount or 80% of eligible accounts receivable. All outstanding borrowings owed under the Credit Agreement become due and payable no later than the extended final maturity date of November 2, 2022.

As of September 30, 2020, and December 31, 2019, we had no outstanding borrowings, and we had availability under the Credit Agreement of approximately $20,000.

As of September 30, 2020, borrowings under the Credit Agreement bear interest at the current prime rate minus 0.25%. In the event of default, obligations shall bear interest at a rate per annum that is 3% above the then applicable rate.

Amendment fees and other commitment fees are included in interest expense. During the three months ended September 30, 2020 and 2019, there was no interest expense, and fees expense and amortization was $15 and $10, respectively. For the nine months ended September 30, 2020 and 2019, there was no interest expense, and fees expense and amortization was $97 and $30, respectively.

Any borrowings are secured by essentially all of our domestic personal property, with a negative pledge on intellectual property. SVB’s security interest in our foreign subsidiaries is limited to 65% of the voting stock of each such foreign subsidiary.

We are required to maintain an Adjusted Quick Ratio of at least 1.0 to 1.0. We are also subject to certain customary limitations on our ability to, among other things, incur debt, grant liens, make acquisitions and other investments, make certain restricted payments such as dividends, dispose of assets or undergo a change in control. As of September 30, 2020, we were in compliance with our covenant under the Credit Agreement.

Contingencies	9 Months Ended
Contingencies	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Legal Matters We are subject to various legal proceedings and claims, either asserted or unasserted, arising in the ordinary course of business. While the outcome of these claims cannot be predicted with certainty, management does not believe the outcome of any of these matters will have a material adverse effect on our business, financial position, results of operations, or cash flows and accordingly, no legal contingencies were accrued as of September 30, 2020 and December 31, 2019. Litigation relating to the content delivery services industry is not uncommon, and we are, and from time to time have been, subject to such litigation. No assurances can be given with respect to the extent or outcome of any such litigation in the future. Taxes We are subject to indirect taxation in various states and foreign jurisdictions. Laws and regulations that apply to communications and commerce conducted over the Internet are becoming more prevalent, both in the United States and internationally, and may impose additional burdens on us conducting business online or providing Internet-related services. Increased regulation could negatively affect our business directly, as well as the businesses of our customers, which could reduce their demand for our services. For example, tax authorities in various states and abroad may impose taxes on the Internet-related revenue we generate based on regulations currently being applied to similar but not directly comparable industries. There are many transactions and calculations where the ultimate tax determination is uncertain. In addition, domestic and international taxation laws are subject to change. In the future, we may come under audit, which could result in changes to our tax estimates. We believe we maintain adequate tax reserves, that are not material in amount, to offset potential liabilities that may arise upon audit. Although we believe our tax estimates and associated reserves are reasonable, the final determination of tax audits and any related litigation could be materially different than the amounts established for tax contingencies. To the extent these estimates ultimately prove to be inaccurate, the associated reserves would be adjusted, resulting in the recording of a benefit or expense in the period in which a change in estimate or a final determination is made.

Net Loss per Share

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Net Loss per Share

We calculate basic and diluted loss per weighted average share. We use the weighted-average number of shares of common stock outstanding during the period for the computation of basic loss per share. Diluted loss per share include the dilutive effect of all potentially dilutive common stock, including awards granted under our equity incentive compensation plans in the weighted-average number of shares of common stock outstanding.

The following table sets forth the components used in the computation of basic and diluted net loss per share for the periods indicated (in thousands, except per share data):


	Three Months Ended September 30,						Nine Months Ended September 30,
	2020		2019		2020		2019
Net loss	$	(3,985)	$	(2,751)	$	(10,968)	$	(18,502)
Basic weighted average outstanding shares of common stock	122,363		116,270		120,519		115,318
Basic weighted average outstanding shares of common stock	122,363		116,270		120,519		115,318
Dilutive effect of stock options, restricted stock units, and other equity incentive plans	—		—		—		—
Diluted weighted average outstanding shares of common stock	122,363		116,270		120,519		115,318
Basic net loss per share	$	(0.03)	$	(0.02)	$	(0.09)	$	(0.16)
Diluted net loss per share:	$	(0.03)	$	(0.02)	$	(0.09)	$	(0.16)

For the three and nine months ended September 30, 2020 and 2019, respectively, the following potentially dilutive common stock, including awards granted under our equity incentive compensation plans were excluded from the computation of diluted net loss per share because including them would have been anti-dilutive.


	Three Months Ended September 30,			Nine Months Ended September 30,
	2020	2019	2020	2019
Employee stock purchase plan	187	324	187	324
Stock options	6,676	1,433	6,401	1,977
Restricted stock units	1,894	567	1,984	884
	8,757	2,324	8,572	3,185

Stockholders' Equity	9 Months Ended
Stockholders' Equity	Sep. 30, 2020
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity Common Stock On March 14, 2017, our board of directors authorized a $25,000 share repurchase program. Any shares repurchased under this program will be canceled and returned to authorized but unissued status. During the nine months ended September 30, 2020 and 2019, we did not repurchase any shares under the repurchase program. As of September 30, 2020, there remained $21,200 under this share repurchase program. Amended and Restated Equity Incentive Plan We established the 2007 Equity Incentive Plan, or the 2007 Plan, which allows for the grant of equity, including stock options and restricted stock unit awards. In June 2016, our stockholders approved the Amended and Restated 2007 Equity Incentive Plan, or the Restated 2007 Plan, which amended and restated the 2007 Plan. Approval of the Restated 2007 Plan replaced the terms and conditions of the 2007 Plan with the terms and conditions of the Restated 2007 Plan and extended the term of the plan to April 2026. There was no increase in the aggregate amount of shares available for issuance. The total number of shares authorized for issuance under the Restated 2007 Plan as of September 30, 2020 was approximately 10,917. Employee Stock Purchase Plan In June 2013, our stockholders approved our 2013 Employee Stock Purchase Plan (ESPP), authorizing the issuance of 4,000 shares. In May 2019, our stockholders approved the adoption of Amendment 1 to the ESPP. Amendment 1 increased the number of shares authorized to 9,000 shares (an increase of 5,000 shares) and amended the maximum number of shares of common stock that an eligible employee may be permitted to purchase during each offering period to be 5 shares. The ESPP allows participants to purchase our common stock at a 15% discount of the lower of the beginning or end of the offering period using the closing price on that day. During the three months ended September 30, 2020, we did not issue any shares under the ESPP. During the nine months ended September 30, 2020, we issued 300 shares under the ESPP. Total cash proceeds from the purchase of shares under the ESPP was approximately $1,075. As of September 30, 2020, shares reserved for issuance to employees under this plan totaled 3,940, and we held employee contributions of $820 (included in other current liabilities) for future purchases under the ESPP. Preferred Stock Our board of directors has authorized the issuance of up to 7,500 shares of preferred stock at September 30, 2020. The preferred stock may be issued in one or more series pursuant to a resolution or resolutions providing for such issuance duly adopted by the board of directors. As of September 30, 2020, the board of directors had not adopted any resolutions for the issuance of preferred stock.

Accumulated Other Comprehensive Loss

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Accumulated Other Comprehensive Loss

Changes in the components of accumulated other comprehensive loss, net of tax, for the nine months ended September 30, 2020, was as follows:




	Foreign		Available for
	Currency		Sale Securities		Total
Balance, December 31, 2019	$	(9,210)	$	—	$	(9,210)
Other comprehensive loss before reclassifications	(89)		(80)		(169)
Amounts reclassified from accumulated other comprehensive loss	—		—		—
Net current period other comprehensive loss	(89)		(80)		(169)
Balance, September 30, 2020	$	(9,299)	$	(80)	$	(9,379)

Share-Based Compensation

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Share-Based Compensation

The following table summarizes the components of share-based compensation expense included in our consolidated statements of operations:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2020		2019		2020		2019
Share-based compensation expense by type:
Stock options	$	1,024	$	1,044	$	3,143	$	3,130
Restricted stock units	713		2,149		8,413		6,834
ESPP	186		165		682		499
Total share-based compensation expense	$	1,923	$	3,358	$	12,238	$	10,463
Share-based compensation expense:
Cost of services	$	130	$	331	$	1,685	$	1,119
General and administrative expense	1,272		2,006		5,770		6,240
Sales and marketing expense	206		584		2,756		1,666
Research and development expense	315		437		2,027		1,438
Total share-based compensation expense	$	1,923	$	3,358	$	12,238	$	10,463

Unrecognized share-based compensation expense totaled approximately $16,692 at September 30, 2020, of which $5,374 related to stock options and $11,318 related to restricted stock units. We currently expect to recognize share-based compensation expense of $3,002 during the remainder of 2020, $8,450 in 2021 and the remainder thereafter based on scheduled vesting of the stock options and restricted stock units outstanding at September 30, 2020.

We have recorded $1,091 of share based compensation expense during the nine months ended September 30, 2020, related to restricted stock units issued as part of our 2019 annual corporate bonus plan.

Operating Leases - Right of Use Assets and Purchase Commitments

9 Months Ended

Sep. 30, 2020

Commitments and Contingencies Disclosure [Abstract]

Operating Leases - Right of Use Assets and Purchase Commitments

Right of Use Assets

We have various operating leases for office space that expire through 2030. Below is a summary of our right of use assets and liabilities as of September 30, 2020.


Right-of-use assets	$	10,844

Lease liability obligations, current	$	2,654
Lease liability obligations, less current portion	11,745
Total lease liability obligations	$	14,399

Weighted-average remaining lease term	8.2 years

Weighted-average discount rate	5.05		%

During the three months ended September 30, 2020, we recognized approximately $752 in operating lease costs. Operating lease costs of $111 are included in cost of revenue, and $641 are included in operating expenses in our consolidated statements of operations. During the three months ended September 30, 2020, cash paid for operating leases was approximately $473. For the nine months ended September 30, 2020, we recognized approximately $2,350 in operating lease costs. Operating lease costs of $360 are included in cost of revenue, and $1,990 are included in operating expenses in our consolidated statements of operations. For the nine months ended September 30, 2020, cash paid for operating leases was approximately $1,438.

During the three months ended September 30, 2019, we recognized approximately $787 in operating lease costs. Operating lease costs of $111 are included in cost of revenue, and $676 are included in operating expenses in our consolidated statements of operations. During the three months ended September 30, 2019, cash paid for operating leases was approximately $463. For the nine months ended September 30, 2019, we recognized approximately $2,730 in operating lease costs. Operating lease costs of $402 are included in cost of revenue, and $2,328 are included in operating expenses in our consolidated statements of operations. For the nine months ended September 30, 2019, cash paid for operating leases was approximately $1,515.

Approximate future minimum lease payments for our right of use assets over the remaining lease periods as of September 30, 2020, are as follows:


Remainder of 2020	$	887
2021	3,065
2022	2,226
2023	1,743
2024	1,441
Thereafter	8,269
Total minimum payments	17,631
Less: amount representing interest	3,232
Total	$	14,399

Purchase Commitments

We have long-term commitments for bandwidth usage and co-location with various networks and Internet service providers. The following summarizes our minimum non-cancellable commitments for future periods as of September 30, 2020:


Remainder of 2020	$	13,444
2021	25,099
2022	11,310
2023	2,848
2024	354
Thereafter	—
Total minimum payments	$	53,055

Concentrations	9 Months Ended
Concentrations	Sep. 30, 2020
Risks and Uncertainties [Abstract]
Concentrations	Concentrations During the three months ended September 30, 2020, we had one customer, Amazon, who represented 10% or more of our total revenue. During the nine months ended September 30, 2020, we had two customers, Amazon and Sony, who each represented 10% or more of our total revenue. During the three and nine months ended September 30, 2019, we had one customer, Amazon, who represented 10% or more of our total revenue. Revenue from customers located within the United States, our country of domicile, was $38,075 for the three months ended September 30, 2020, compared to $32,052 for the three months ended September 30, 2019. For the nine months ended September 30, 2020, revenue from customers located within the United States was $107,698, compared to $84,115 for the nine months ended September 30, 2019. During the three and nine months ended September 30, 2020 and 2019, based on customer location, we had three countries, the United States, Japan, and the United Kingdom, that accounted for 10% or more of our total revenue.

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income taxes for the interim periods presented have been included in the accompanying consolidated financial statements on the basis of an estimated annual effective tax rate. Based on an estimated annual effective tax rate and discrete items, income tax expense for the three months ended September 30, 2020 and 2019, was $66 and $166, respectively. For the nine months ended September 30, 2020 and 2019, income tax expense was $377 and $544, respectively. Income tax expense was different than the statutory income tax rate primarily due to us providing for a valuation allowance on deferred tax assets in certain jurisdictions, and the recording of state and foreign tax expense for the three month periods. We file income tax returns in jurisdictions with varying statutes of limitations. Tax years 2017 through 2019 remain subject to examination by federal tax authorities. Tax years 2016 through 2019 generally remain subject to examination by state tax authorities. As of September 30, 2020, we are not under any federal or state examination for income taxes. For the three and nine months ended September 30, 2020 and 2019, there was no impact to income tax expense related to the Global Intangible Low-Taxed Income inclusion (GILTI) as a result of our net operating loss carryforwards (NOL) and valuation allowance position. We do not expect the GILTI to have a material impact on future earnings due to our NOL and valuation allowance position. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) was enacted in response to the COVID-19 pandemic. The CARES Act, among other things, permits NOL carryovers and carrybacks to offset 100% of taxable income for taxable years beginning before 2021. In addition, the CARES Act allows NOLs incurred in 2018, 2019, and 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid income taxes. We are currently evaluating the impact of the CARES Act, but at present do not expect that the NOL carryback provision of the CARES Act would result in a cash benefit to us.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Segment Reporting and Geographic Areas

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Segment Reporting and Geographic Areas

Our chief operating decision maker (who is our Chief Executive Officer) reviews our financial information presented on a consolidated basis for purposes of allocating resources and evaluating our financial performance. We operate in one industry segment — content delivery and related services and we operate in three geographic areas — Americas, Europe, Middle East, and Africa (EMEA), and Asia Pacific.

Revenue by geography is based on the location of the customer from which the revenue is earned. The following table sets forth our revenue by geographic area:


	Three Months Ended September 30,															Nine Months Ended September 30,
	2020						2019						2020					2019
Americas	$	38,594	65	%	$	32,860	64	%	$	109,652	63	%		$	86,865	62	%
EMEA	8,590		15	%	7,574		15	%	27,411		16	%		22,122		16	%
Asia Pacific	12,059		20	%	10,887		21	%	37,738		21	%		31,518		22	%
Total revenue	$	59,243	100	%	$	51,321	100	%	$	174,801	100	%		$	140,505	100	%

The following table sets forth the individual countries and their respective revenue for those countries whose revenue exceeded 10% of our total revenue:


	Three Months Ended September 30,						Nine Months Ended September 30,
Country / Region	2020		2019		2020		2019
United States / Americas	$	38,075	$	32,052	$	107,698	$	84,115
United Kingdom / EMEA	$	6,939	$	5,813	$	22,016	$	16,227
Japan / Asia Pacific	$	7,703	$	6,556	$	24,251	$	18,061

The following table sets forth long-lived assets by geographic area in which the assets are located:


	September 30,		December 31,
	2020		2019
Americas	$	34,264	$	33,450
International	13,229		12,686
Total long-lived assets	$	47,493	$	46,136

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Fair Value Measurements

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements

As of September 30, 2020, and December 31, 2019, we held certain assets and liabilities that were required to be measured at fair value on a recurring basis.

The following is a summary of fair value measurements at September 30, 2020:


			Fair Value Measurements at Reporting Date Using
Description	Total		Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds (2)	$	39,968	$	39,968	$	—	$	—
Certificate of deposit (1)	40		—		40		—
Corporate notes and bonds (1)	46,627		—		46,627		—
Municipal securities (1)	2,996		—		2,996		—
Total assets measured at fair value	$	89,631	$	39,968	$	49,663	$	—

_______________

(1) Classified in marketable securities

(2) Classified in cash and cash equivalents

The following is a summary of fair value measurements at December 31, 2019:

Fair Value Measurements at Reporting Date Using

Description

Total

Quoted Prices In Active Markets for Identical Assets
(Level 1)

Significant
Other
Observable
Inputs
(Level 2)

Significant
Unobservable
Inputs
(Level 3)

Assets:

Certificate of deposit (1)

—

_________________

(1) Classified in marketable securities

The carrying amount of cash equivalents approximates fair value because their maturity is less than three months. The carrying amount of short-term and long-term marketable securities approximates fair value as the securities are marked to market as of each balance sheet date with any unrealized gains and losses reported in stockholders’ equity. The carrying amount of accounts receivable, accounts payable, and accrued liabilities approximates fair value due to the short-term maturity of the amounts.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC. They do not include all of the information and footnotes required by U.S. generally accepted accounting principles (U.S. GAAP) for complete financial statements. Such interim financial information is unaudited but reflects all adjustments that are, in the opinion of management, necessary for the fair presentation of the interim periods presented and of a normal recurring nature. This quarterly report on Form 10-Q should be read in conjunction with our audited financial statements and footnotes included in our annual report on Form 10-K for the fiscal year ended December 31, 2019. All information is presented in thousands, except per share amounts and where specifically noted. The consolidated financial statements include accounts of Limelight and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated. In addition, certain other reclassifications have been made to prior year amounts to conform to the current year presentation.
Use of Estimates	Use of Estimates The preparation of the consolidated financial statements and related disclosures in conformity with U.S. GAAP requires management to make judgments, assumptions, and estimates that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results and outcomes may differ from those estimates. The results of operations presented in this quarterly report on Form 10-Q are not necessarily indicative of the results that may be expected for the year ending December 31, 2020, or for any future periods.
Recent Accounting Standards	Recent Accounting Standards Adopted Accounting Standards In June 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-13, which requires measurement and recognition of expected credit losses for financial assets held. The standard is to be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. We adopted this guidance effective January 1, 2020. The adoption of this guidance did not have a material impact on our consolidated financial statements and related disclosures and there was no cumulative-effect adjustment required. In January 2017, the FASB issued ASU 2017-04, which simplifies the accounting for goodwill impairment. The updated guidance eliminates Step 2 of the impairment test, which requires entities to calculate the implied fair value of goodwill to measure a goodwill impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value, determined in Step 1. We adopted this guidance effective January 1, 2020, using a prospective approach. The adoption of this guidance did not have a material impact on our consolidated financial statements and related disclosures. In August 2018, the FASB issued ASU 2018-13, which removes, modifies and adds to the disclosure requirements on fair value measurements in Topic 820. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. An entity is permitted to early adopt any removed or modified disclosures upon issuance of this updated guidance and delay adoption of the additional disclosures until their effective date. We adopted this guidance effective January 1, 2020. The adoption of this guidance did not have a material impact on our consolidated financial statements and related disclosures. In August 2018, the FASB issued ASU 2018-15, to help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement (hosting arrangement) by providing guidance for determining when the arrangement includes a software license. The amendments align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments. We adopted this guidance effective January 1, 2020. The adoption of this guidance did not have a material impact on our consolidated financial statements and related disclosures. Recently Issued Accounting Standards In December 2019, the FASB issued ASU 2019-12 to simplifying the accounting for income taxes. ASU 2019-12 is intended to simplify various aspects related to accounting for income taxes, eliminates certain exceptions to the general principles in the Accounting Standards Codification (ASC) Topic 740 related to intra-period tax allocation, simplifies when companies recognize deferred taxes in an interim period, and clarifies certain aspects of the current guidance to promote consistent application. This guidance is effective for public business entities for fiscal years beginning after December 15, 2020, and for interim periods within those fiscal years, with early adoption permitted. ASU 2019-12 requires a retrospective, modified retrospective or prospective transition approach for individual aspects of the ASU. This guidance is applicable to us for our fiscal year beginning January 1, 2021. We are currently evaluating the potential impact of this guidance on our consolidated financial statements. In August 2020, the FASB issued ASU 2020-06, which simplifies the accounting for convertible instruments. ASU 2020-06 eliminates certain models that require separate accounting for embedded conversion features, in certain cases. Additionally, among other changes, the guidance eliminates certain of the conditions for equity classification for contracts in an entity’s own equity. ASU 2020-06 also requires entities to use the if-converted method for all convertible instruments in the diluted earnings per share calculation and include the effect of share settlement for instruments that may be settled in cash or shares, except for certain liability-classified share-based payment awards. ASU 2020-06 is effective for our fiscal year beginning after December 15, 2021, including interim periods within this fiscal year. Early adoption is permitted, but no earlier than our fiscal year beginning after December 15, 2020, including interim periods within those fiscal years. This guidance can be applied using either a modified or full retrospective approach. We expect to early adopt this guidance, however at this time we are currently evaluating the impact this guidance will have on our consolidated financial statements.
Convertible Senior Notes	Convertible Senior Notes In July 2020, we issued $125,000 aggregate principal amount of 3.50% convertible senior notes. We separate our convertible senior notes (the Notes) into liability and equity components. The carrying amount of the liability component is calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option is determined by deducting the fair value of the liability component from the principal amount of the Notes. The excess of the principal amount of the Notes over the carrying amount of the liability component (debt discount) is amortized to interest expense at an effective interest rate over the contractual term of the Notes. The equity component is recorded in additional paid-in capital and is not remeasured as long as it continues to meet the conditions for equity classification. We allocate the issuance costs to the liability and equity components of the Notes based on the proportion of the proceeds allocated to the debt and equity components. Issuance costs attributable to the liability component are amortized to interest expense using the effective interest method over the contractual terms of the Notes. Issuance costs attributable to the equity component are netted with the equity component in stockholders’ equity.
Revenue Recognition	Revenue Recognition Revenues are recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. For contracts that contain minimum commitments over the contractual term, we estimate an amount of variable consideration by using either the expected value method or the most likely amount method. We include estimates of variable consideration in revenue only when we have a high degree of confidence that revenue will not be reversed in a subsequent reporting period. We believe that the expected value method is the most appropriate estimate of the amount of variable consideration. These customers have entered into contracts with contract terms generally from one to four years.

- Definition

Disclosure of accounting policy for revenue from contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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+ Details

Investments in Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Summary of Marketable Securities

The following is a summary of marketable securities (designated as available-for-sale) at September 30, 2020.


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Certificate of deposit	$	40	$	—	$	—	$	40
Corporate notes and bonds	46,705		—		78		46,627
Municipal securities	2,997		1		2		2,996
Total marketable securities	$	49,742	$	1	$	80	$	49,663

The following is a summary of marketable securities (designated as available-for-sale) at December 31, 2019.


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Certificate of deposit	$	40	$	—	$	—	$	40

Amortized Cost and Estimated Fair Value of Marketable Securities by Maturity

The amortized cost and estimated fair value of marketable securities at September 30, 2020, by maturity are shown below:


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available-for-sale securities:
Due in one year or less	$	42,175	$	1	$	69	$	42,107
Due after one year and through five years	7,567		—		11		7,556
Total marketable securities	$	49,742	$	1	$	80	$	49,663

The amortized cost and estimated fair value of marketable securities at December 31, 2019, by maturity are shown below:


	Amortized Cost	Gross Unrealized Gains	Gross Unrealized Losses	Estimated Fair Value
Available-for-sale securities:

Due after one year and through five years	40	—	—	40

Accounts Receivable, net (Tables)

9 Months Ended

Sep. 30, 2020

Receivables [Abstract]

Summary of Accounts Receivable and Allowances for Doubtful Accounts

Accounts receivable, net include:


	September 30,		December 31,
	2020		2019
Accounts receivable	$	43,306	$	35,619
Less: credit allowance	(200)		(170)
Less: allowance for doubtful accounts	(884)		(973)
Total accounts receivable, net	$	42,222	$	34,476

The following is a roll-forward of the allowances for doubtful accounts related to trade accounts receivable for the nine months ended September 30, 2020:


			Nine Months Ended
			September 30, 2020
Beginning of period			973
Provision for credit losses			476
Write-offs			(565)
End of period			884

Prepaid Expenses and Other Current Assets (Tables)

9 Months Ended

Sep. 30, 2020

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets include:


	September 30,		December 31,
	2020		2019
Prepaid bandwidth and backbone	1,324		1,717
VAT receivable	3,877		3,068
Prepaid expenses and insurance	2,731		1,685
Vendor deposits and other	4,629		3,450
Total prepaid expenses and other current assets	$	12,561	$	9,920

Property and Equipment, net (Tables)

9 Months Ended

Sep. 30, 2020

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment, net include:


	September 30,		December 31,
	2020		2019
Network equipment	$	134,082	$	126,975
Computer equipment and software	7,293		7,603
Furniture and fixtures	1,785		1,906
Leasehold improvements	7,455		7,888
Other equipment	21		54
Total property and equipment	150,636		144,426
Less: accumulated depreciation	(103,143)		(98,290)
Total property and equipment, net	$	47,493	$	46,136

Other Current Liabilities (Tables)

9 Months Ended

Sep. 30, 2020

Other Liabilities Disclosure [Abstract]

Schedule of Other Current Liabilities

Other current liabilities include:


	September 30,		December 31,
	2020		2019
Accrued compensation and benefits	$	8,565	$	4,918
Accrued cost of revenue	5,104		4,176
Accrued interest payable	791		—
Other accrued expenses	3,124		4,304
Total other current liabilities	$	17,584	$	13,398

Debt (Tables)

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Schedule of Convertible Debt

The net carrying amount of the liability and equity components of the Notes was as follows:


	September 30,
	2020
Liability component:
Principal	$	125,000
Debt discount (equity component)	(21,747)
Unamortized transaction costs	(3,316)
Net carrying amount	$	99,937

Equity component, net of transaction costs	$	21,747

Interest expense recognized related to the Notes was as follows:


	Three and Nine Months
	Ended September 30, 2020
Contractual interest expense	$	791
Amortization of debt discount	753
Amortization of transaction costs	115
Total	$	1,659

Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Loss per Share

The following table sets forth the components used in the computation of basic and diluted net loss per share for the periods indicated (in thousands, except per share data):


	Three Months Ended September 30,						Nine Months Ended September 30,
	2020		2019		2020		2019
Net loss	$	(3,985)	$	(2,751)	$	(10,968)	$	(18,502)
Basic weighted average outstanding shares of common stock	122,363		116,270		120,519		115,318
Basic weighted average outstanding shares of common stock	122,363		116,270		120,519		115,318
Dilutive effect of stock options, restricted stock units, and other equity incentive plans	—		—		—		—
Diluted weighted average outstanding shares of common stock	122,363		116,270		120,519		115,318
Basic net loss per share	$	(0.03)	$	(0.02)	$	(0.09)	$	(0.16)
Diluted net loss per share:	$	(0.03)	$	(0.02)	$	(0.09)	$	(0.16)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share


	Three Months Ended September 30,			Nine Months Ended September 30,
	2020	2019	2020	2019
Employee stock purchase plan	187	324	187	324
Stock options	6,676	1,433	6,401	1,977
Restricted stock units	1,894	567	1,984	884
	8,757	2,324	8,572	3,185

Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Loss

Changes in the components of accumulated other comprehensive loss, net of tax, for the nine months ended September 30, 2020, was as follows:




	Foreign		Available for
	Currency		Sale Securities		Total
Balance, December 31, 2019	$	(9,210)	$	—	$	(9,210)
Other comprehensive loss before reclassifications	(89)		(80)		(169)
Amounts reclassified from accumulated other comprehensive loss	—		—		—
Net current period other comprehensive loss	(89)		(80)		(169)
Balance, September 30, 2020	$	(9,299)	$	(80)	$	(9,379)

Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Components of Share-based Compensation Expense

The following table summarizes the components of share-based compensation expense included in our consolidated statements of operations:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2020		2019		2020		2019
Share-based compensation expense by type:
Stock options	$	1,024	$	1,044	$	3,143	$	3,130
Restricted stock units	713		2,149		8,413		6,834
ESPP	186		165		682		499
Total share-based compensation expense	$	1,923	$	3,358	$	12,238	$	10,463
Share-based compensation expense:
Cost of services	$	130	$	331	$	1,685	$	1,119
General and administrative expense	1,272		2,006		5,770		6,240
Sales and marketing expense	206		584		2,756		1,666
Research and development expense	315		437		2,027		1,438
Total share-based compensation expense	$	1,923	$	3,358	$	12,238	$	10,463

Operating Leases - Right of Use Assets and Purchase Commitments (Tables)

9 Months Ended

Sep. 30, 2020

Commitments and Contingencies Disclosure [Abstract]

Summary of Right-of-use Assets and Lease Liabilities

Below is a summary of our right of use assets and liabilities as of September 30, 2020.


Right-of-use assets	$	10,844

Lease liability obligations, current	$	2,654
Lease liability obligations, less current portion	11,745
Total lease liability obligations	$	14,399

Weighted-average remaining lease term	8.2 years

Weighted-average discount rate	5.05		%

Future Minimum Lease Payments Over Remaining Lease Periods

Approximate future minimum lease payments for our right of use assets over the remaining lease periods as of September 30, 2020, are as follows:


Remainder of 2020	$	887
2021	3,065
2022	2,226
2023	1,743
2024	1,441
Thereafter	8,269
Total minimum payments	17,631
Less: amount representing interest	3,232
Total	$	14,399

Minimum Purchase Commitments

The following summarizes our minimum non-cancellable commitments for future periods as of September 30, 2020:


Remainder of 2020	$	13,444
2021	25,099
2022	11,310
2023	2,848
2024	354
Thereafter	—
Total minimum payments	$	53,055

Segment Reporting and Geographic Areas (Tables)

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Revenue Earned by Geographic Area

The following table sets forth our revenue by geographic area:


	Three Months Ended September 30,															Nine Months Ended September 30,
	2020						2019						2020					2019
Americas	$	38,594	65	%	$	32,860	64	%	$	109,652	63	%		$	86,865	62	%
EMEA	8,590		15	%	7,574		15	%	27,411		16	%		22,122		16	%
Asia Pacific	12,059		20	%	10,887		21	%	37,738		21	%		31,518		22	%
Total revenue	$	59,243	100	%	$	51,321	100	%	$	174,801	100	%		$	140,505	100	%

Schedule of Concentration of Revenue by Country

The following table sets forth the individual countries and their respective revenue for those countries whose revenue exceeded 10% of our total revenue:


	Three Months Ended September 30,						Nine Months Ended September 30,
Country / Region	2020		2019		2020		2019
United States / Americas	$	38,075	$	32,052	$	107,698	$	84,115
United Kingdom / EMEA	$	6,939	$	5,813	$	22,016	$	16,227
Japan / Asia Pacific	$	7,703	$	6,556	$	24,251	$	18,061

Long-lived Assets by Geographical Area

The following table sets forth long-lived assets by geographic area in which the assets are located:


	September 30,		December 31,
	2020		2019
Americas	$	34,264	$	33,450
International	13,229		12,686
Total long-lived assets	$	47,493	$	46,136

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Summary of Money Market Funds, Marketable Securities, Other Investment-related Assets and Current Liabilities

The following is a summary of fair value measurements at September 30, 2020:


			Fair Value Measurements at Reporting Date Using
Description	Total		Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds (2)	$	39,968	$	39,968	$	—	$	—
Certificate of deposit (1)	40		—		40		—
Corporate notes and bonds (1)	46,627		—		46,627		—
Municipal securities (1)	2,996		—		2,996		—
Total assets measured at fair value	$	89,631	$	39,968	$	49,663	$	—

_______________

(1) Classified in marketable securities

(2) Classified in cash and cash equivalents

The following is a summary of fair value measurements at December 31, 2019:

Fair Value Measurements at Reporting Date Using

Description

Total

Quoted Prices In Active Markets for Identical Assets
(Level 1)

Significant
Other
Observable
Inputs
(Level 2)

Significant
Unobservable
Inputs
(Level 3)

Assets:

Certificate of deposit (1)

—

_________________

(1) Classified in marketable securities

Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jul. 27, 2020
Debt Instrument [Line Items]
Contract terms			These customers have entered into contracts with contract terms generally from one to four years.
Committed revenue from minimum commitment contracts	$ 3,641,000		$ 3,641,000
Minimum commitment contracts revenue recognized in period	$ 1,911,000	$ 2,200,000	$ 6,008,000	$ 7,400,000
Convertible Senior Notes due 2025 \| Convertible debt
Debt Instrument [Line Items]
Aggregate principal amount					$ 125,000,000
Stated interest rate					3.50%

Summary of Significant Accounting Policies - Performance Obligations (Details)	Sep. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining unsatisfied performance obligations to be recognized period	3 months
Percent of remaining unsatisfied performance obligations to be recognized	37.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining unsatisfied performance obligations to be recognized period	1 year
Percent of remaining unsatisfied performance obligations to be recognized	57.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining unsatisfied performance obligations to be recognized period	1 year
Percent of remaining unsatisfied performance obligations to be recognized	6.00%

Investments in Marketable Securities - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 49,742
Gross Unrealized Gains	1
Gross Unrealized Losses	80
Estimated Fair Value	49,663
Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40	$ 40
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	40	$ 40
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	46,705
Gross Unrealized Gains	0
Gross Unrealized Losses	78
Estimated Fair Value	46,627
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,997
Gross Unrealized Gains	1
Gross Unrealized Losses	2
Estimated Fair Value	$ 2,996

Investments in Marketable Securities - Amortized Cost and Estimated Fair Value of Marketable Securities by Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 42,175
Amortized Cost, Due after one year and through five years	7,567	$ 40
Amortized Cost	49,742
Gross Unrealized Gains, Due in one year or less	1
Gross Unrealized Gains, Due after one year and through five years	0	0
Gross Unrealized Gains	1
Gross Unrealized Losses, Due in one year or less	69
Gross Unrealized Losses, Due after one year and through five years	11	0
Gross Unrealized Losses	80
Estimated Fair Value, Due in one year or less	42,107
Estimated Fair Value, Due after one year and through five years	7,556	$ 40
Estimated Fair Value	$ 49,663

Accounts Receivable, net (Details) - USD ($) $ in Thousands	9 Months Ended
Accounts Receivable, net (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Summary of Accounts Receivable, net
Accounts receivable			$ 43,306	$ 35,619
Less: credit allowance			(200)	(170)
Less: allowance for doubtful accounts	$ (973)		(884)	(973)
Total accounts receivable, net			$ 42,222	$ 34,476
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period	973
Provision for credit losses	476	$ 1,274
Write-offs	(565)
End of period	$ 884

Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid bandwidth and backbone	$ 1,324	$ 1,717
VAT receivable	3,877	3,068
Prepaid expenses and insurance	2,731	1,685
Vendor deposits and other	4,629	3,450
Total prepaid expenses and other current assets	$ 12,561	$ 9,920

Property and Equipment, net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property and equipment, net
Total property and equipment	$ 150,636	$ 144,426
Less: accumulated depreciation	(103,143)	(98,290)
Total property and equipment, net	47,493	46,136
Network equipment
Property and equipment, net
Total property and equipment	134,082	126,975
Computer equipment and software
Property and equipment, net
Total property and equipment	7,293	7,603
Furniture and fixtures
Property and equipment, net
Total property and equipment	1,785	1,906
Leasehold improvements
Property and equipment, net
Total property and equipment	7,455	7,888
Other equipment
Property and equipment, net
Total property and equipment	$ 21	$ 54

Property and Equipment, net - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Abstract]
Cost of revenue depreciation expense	$ 5,602	$ 4,961	$ 16,112	$ 13,905
Operating expense depreciation	$ 384	$ 172	$ 1,049	$ 545

Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Accrued compensation and benefits	$ 8,565	$ 4,918
Accrued cost of revenue	5,104	4,176
Accrued interest payable	791	0
Other accrued expenses	3,124	4,304
Total other current liabilities	$ 17,584	$ 13,398

Debt - Narrative (Details) $ / shares in Units, shares in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 27, 2020 USD ($) trading_Day $ / shares shares	Jul. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jul. 22, 2020 $ / shares	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Share price (in dollars per share) \| $ / shares							$ 6.69
Convertible debt, fair value			$ 129,741,000		$ 129,741,000
Costs incurred for capped calls			16,413,000		16,413,000
Capped call
Line of Credit Facility [Line Items]
Initial strike price (in dollars per share) \| $ / shares	$ 8.53
Initial cap price (in dollars per share) \| $ / shares	$ 13.38
Number of shares covered by capped calls \| shares	14.7
Costs incurred for capped calls	$ 16,400,000
Convertible Senior Notes due 2025 \| Convertible debt
Line of Credit Facility [Line Items]
Aggregate principal amount	$ 125,000,000
Stated interest rate	3.50%
Additional principal amount, option	$ 15,000,000
Net proceeds from debt issuance	$ 120,816,000
Conversion price (in dollars per share) \| $ / shares	$ 8.53
Conversion ratio	0.1172367
Share price premium	27.50%
Carrying amount	$ 102,500,000		99,937,000		99,937,000
Effective interest rate	8.60%
Equity component, gross amount	$ 22,500,000
Debt term	5 years
Transaction costs, liability component	$ 3,400,000
Transaction costs, equity component	$ 800,000
Contractual interest expense			791,000		791,000
Amortization of transaction costs			115,000		115,000
Convertible Senior Notes due 2025 \| Convertible debt \| Maximum
Line of Credit Facility [Line Items]
Conversion ratio	0.1494768
Convertible Senior Notes due 2025 \| Convertible debt \| Conversion covenant one
Line of Credit Facility [Line Items]
Threshold percentage of stock price trigger	130.00%
Conversion price (in dollars per share) \| $ / shares	$ 8.53
Threshold trading days \| trading_Day	20
Threshold consecutive trading days \| trading_Day	30
Convertible Senior Notes due 2025 \| Convertible debt \| Conversion covenant two
Line of Credit Facility [Line Items]
Threshold percentage of stock price trigger	98.00%
Threshold consecutive trading days \| trading_Day	10
Consecutive trading days immediately after measurement period \| trading_Day	5
Convertible Senior Notes due 2025 \| Convertible debt \| Redemption option
Line of Credit Facility [Line Items]
Threshold percentage of stock price trigger	130.00%
Threshold trading days \| trading_Day	41
Threshold consecutive trading days \| trading_Day	30
Redemption price percentage	100.00%
Convertible Senior Notes due 2025 \| Convertible debt \| Upon fundamental change
Line of Credit Facility [Line Items]
Redemption price percentage	100.00%
Revolving credit facility \| Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing amount		$ 20,000,000
Borrowing capacity limit, percent of accounts receivable		80.00%
Proceeds from line of credit			0		0			$ 0
Current borrowing capacity			$ 20,000,000		$ 20,000,000			$ 20,000,000
Increase in interest rate in event of default			3.00%		3.00%
Contractual interest expense			$ 0	$ 0	$ 0	$ 0
Amortization of transaction costs			$ 15,000	$ 10,000	$ 97,000	$ 30,000
Voting stock percentage in foreign subsidiaries					65.00%
Line of credit facility, covenant compliance, adjusted quick ratio			1.0		1.0
Revolving credit facility \| Credit Agreement \| Alternative base rate
Line of Credit Facility [Line Items]
Variable rate minimum					0.25%

Debt - Schedule of Convertible Debt (Details) - Convertible Senior Notes due 2025 - Convertible debt - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jul. 27, 2020
Liability component:
Principal	$ 125,000	$ 125,000
Debt discount (equity component)	(21,747)	(21,747)
Unamortized transaction costs	(3,316)	(3,316)
Net carrying amount	99,937	99,937	$ 102,500
Equity component, net of transaction costs	21,747	21,747
Interest Expense
Contractual interest expense	791	791
Amortization of debt discount	753	753
Amortization of transaction costs	115	115
Total	$ 1,659	$ 1,659

Net Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net loss	$ (3,985)	$ (2,751)	$ (10,968)	$ (18,502)
Basic weighted average outstanding shares of common stock	122,363	116,270	120,519	115,318
Dilutive effect of stock options, restricted stock units, and other equity incentive plans (in shares)	0	0	0	0
Diluted weighted average outstanding shares of common stock	122,363	116,270	120,519	115,318
Basic net loss per share (in dollars per share)	$ (0.03)	$ (0.02)	$ (0.09)	$ (0.16)
Diluted net loss per share (in dollars per share)	$ (0.03)	$ (0.02)	$ (0.09)	$ (0.16)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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-Section 45
-Paragraph 60B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(27))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(23))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1337-109256

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(25))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Net Loss per Share - Dilutive Common Stock (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded outstanding options and restricted stock units (in shares)	8,757	2,324	8,572	3,185
Employee stock purchase plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded outstanding options and restricted stock units (in shares)	187	324	187	324
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded outstanding options and restricted stock units (in shares)	6,676	1,433	6,401	1,977
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded outstanding options and restricted stock units (in shares)	1,894	567	1,984	884

Stockholders' Equity (Details) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
Stockholders' Equity (Details) - USD ($)	May 31, 2019	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Mar. 14, 2017	Jun. 30, 2013
Equity, Class of Treasury Stock [Line Items]
Issuance of common stock under employee stock purchase plan			$ 1,074,000	$ 1,095,000
Issuance of preferred stock authorized (in shares)		7,500,000	7,500,000		7,500,000
Employee Stock Purchase Plan
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized for issuance	9,000,000						4,000,000
Increase in shares available for issuance	5,000,000
Maximum number of shares permitted to purchase per period	5,000
Discount from market price for employees			15.00%
Shares issued		0	300,000
Issuance of common stock under employee stock purchase plan			$ 1,075,000
Common Stock reserved for future options and restricted stock awards (in shares)		3,940,000	3,940,000
Employee funds held by company for future purchase of shares		$ 820,000	$ 820,000
2007 Equity Incentive Plan
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized for issuance		10,917,000	10,917,000
2017 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase amount authorized						$ 25,000,000
Shares purchased and canceled			0	0
Remaining authorized repurchase amount		$ 21,200,000	$ 21,200,000

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 169,815	$ 156,646	$ 166,537	$ 165,151
Other comprehensive loss before reclassifications			(169)
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income (loss)	652	(355)	(169)	196
Ending balance	177,679	157,924	177,679	157,924
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(10,031)	(9,482)	(9,210)	(10,033)
Ending balance	(9,379)	$ (9,837)	(9,379)	$ (9,837)
Foreign Currency
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(9,210)
Other comprehensive loss before reclassifications			(89)
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income (loss)			(89)
Ending balance	(9,299)		(9,299)
Available for Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			0
Other comprehensive loss before reclassifications			(80)
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income (loss)			(80)
Ending balance	$ (80)		$ (80)

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References + Details

Share-Based Compensation - Components of Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Components of share-based compensation expense
Share-based compensation	$ 1,923	$ 3,358	$ 12,238	$ 10,463
Cost of services
Components of share-based compensation expense
Share-based compensation	130	331	1,685	1,119
General and administrative expense
Components of share-based compensation expense
Share-based compensation	1,272	2,006	5,770	6,240
Sales and marketing expense
Components of share-based compensation expense
Share-based compensation	206	584	2,756	1,666
Research and development expense
Components of share-based compensation expense
Share-based compensation	315	437	2,027	1,438
Stock options
Components of share-based compensation expense
Share-based compensation	1,024	1,044	3,143	3,130
Restricted stock units
Components of share-based compensation expense
Share-based compensation	713	2,149	8,413	6,834
ESPP
Components of share-based compensation expense
Share-based compensation	$ 186	$ 165	$ 682	$ 499

Share-Based Compensation - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense total	$ 16,692		$ 16,692
Share-based compensation expense, remainder of year	3,002		3,002
Share-based compensation expense, 2021	8,450		8,450
Share-based compensation expense	1,923	$ 3,358	12,238	$ 10,463
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense total	5,374		5,374
Share-based compensation expense	1,024	1,044	3,143	3,130
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense total	11,318		11,318
Share-based compensation expense	$ 713	$ 2,149	8,413	$ 6,834
Annual Corporate Bonus Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 1,091

Operating Leases - Right of Use Assets and Purchase Commitments - Right-of-use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating Leased Assets [Line Items]
Right-of-use assets	$ 10,844		$ 10,844		$ 12,842
Operating lease liability obligations	2,654		2,654		2,056
Operating lease liability obligations, less current portion	11,745		11,745		$ 13,488
Total lease liability obligations	$ 14,399		$ 14,399
Weighted-average remaining lease term	8 years 2 months 12 days		8 years 2 months 12 days
Weighted-average discount rate	5.05%		5.05%
Operating lease costs	$ 752	$ 787	$ 2,350	$ 2,730
Operating cash flows from operating leases	473	463	1,438	1,515
Cost of Revenue
Operating Leased Assets [Line Items]
Operating lease costs	111	111	360	402
Operating Expenses
Operating Leased Assets [Line Items]
Operating lease costs	$ 641	$ 676	$ 1,990	$ 2,328

Operating Leases - Right of Use Assets and Purchase Commitments - Future Minimum Lease Payments Over Remaining Lease Periods (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Future minimum lease payments over remaining lease periods
Remainder of 2020	$ 887
2021	3,065
2022	2,226
2023	1,743
2024	1,441
Thereafter	8,269
Total minimum payments	17,631
Less: amount representing interest	3,232
Total	$ 14,399

Operating Leases - Right of Use Assets and Purchase Commitments - Minimum Purchase Commitments (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Minimum purchase commitments
Remainder of 2020	$ 13,444
2021	25,099
2022	11,310
2023	2,848
2024	354
Thereafter	0
Total minimum payments	$ 53,055

Concentrations (Details) $ in Thousands	3 Months Ended		9 Months Ended
Concentrations (Details) $ in Thousands	Sep. 30, 2020 USD ($) customer country	Sep. 30, 2019 USD ($) customer country	Sep. 30, 2020 USD ($) customer country	Sep. 30, 2019 USD ($) customer country
Concentration Risk [Line Items]
Number of customers who represented 10% or more of total revenue \| customer	1	1	2	1
Revenue	$ 59,243	$ 51,321	$ 174,801	$ 140,505
Geographic concentration \| Sales revenue
Concentration Risk [Line Items]
Number of countries accounting for 10% or more of revenue \| country	3	3	3	3
United States / Americas \| Geographic concentration \| Sales revenue
Concentration Risk [Line Items]
Revenue	$ 38,075	$ 32,052	$ 107,698	$ 84,115

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

+ Details

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income tax expense	$ 66	$ 166	$ 377	$ 544

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Segment Reporting and Geographic Areas - Narrative (Details)	9 Months Ended
	Sep. 30, 2020 Segment Location
Segment Reporting [Abstract]
Number of industry segment \| Segment	1
Number of geographic areas \| Location	3

Segment Reporting and Geographic Areas - Revenue Earned by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue earned by geographic area
Revenue	$ 59,243	$ 51,321	$ 174,801	$ 140,505
Americas
Revenue earned by geographic area
Revenue	38,594	32,860	109,652	86,865
EMEA
Revenue earned by geographic area
Revenue	8,590	7,574	27,411	22,122
Asia Pacific
Revenue earned by geographic area
Revenue	$ 12,059	$ 10,887	$ 37,738	$ 31,518
Sales revenue \| Geographic concentration
Revenue earned by geographic area
Percent of revenue	100.00%	100.00%	100.00%	100.00%
Sales revenue \| Geographic concentration \| Americas
Revenue earned by geographic area
Percent of revenue	65.00%	64.00%	63.00%	62.00%
Sales revenue \| Geographic concentration \| EMEA
Revenue earned by geographic area
Percent of revenue	15.00%	15.00%	16.00%	16.00%
Sales revenue \| Geographic concentration \| Asia Pacific
Revenue earned by geographic area
Percent of revenue	20.00%	21.00%	21.00%	22.00%

- Definition

+ References

+ Details

Segment Reporting and Geographic Areas - Schedule of Concentration of Revenue by Country (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Concentration Risk [Line Items]
Revenue	$ 59,243	$ 51,321	$ 174,801	$ 140,505
Geographic concentration \| Sales revenue \| United States / Americas
Concentration Risk [Line Items]
Revenue	38,075	32,052	107,698	84,115
Geographic concentration \| Sales revenue \| United Kingdom / EMEA
Concentration Risk [Line Items]
Revenue	6,939	5,813	22,016	16,227
Geographic concentration \| Sales revenue \| Japan / Asia Pacific
Concentration Risk [Line Items]
Revenue	$ 7,703	$ 6,556	$ 24,251	$ 18,061

- Definition

+ References

+ Details

Segment Reporting and Geographic Areas - Long-lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Long-lived assets by geographical area
Long-lived assets	$ 47,493	$ 46,136
Americas
Long-lived assets by geographical area
Long-lived assets	34,264	33,450
International
Long-lived assets by geographical area
Long-lived assets	$ 13,229	$ 12,686

Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	$ 89,631
Money market funds
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	39,968
Certificate of deposit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	40	$ 40
Corporate notes and bonds
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	46,627
Municipal securities
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	2,996
Quoted Prices In Active Markets for Identical Assets (Level 1)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	39,968
Quoted Prices In Active Markets for Identical Assets (Level 1) \| Money market funds
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	39,968
Quoted Prices In Active Markets for Identical Assets (Level 1) \| Certificate of deposit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	0	0
Quoted Prices In Active Markets for Identical Assets (Level 1) \| Corporate notes and bonds
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	0
Quoted Prices In Active Markets for Identical Assets (Level 1) \| Municipal securities
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	0
Significant Other Observable Inputs (Level 2)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	49,663
Significant Other Observable Inputs (Level 2) \| Money market funds
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	0
Significant Other Observable Inputs (Level 2) \| Certificate of deposit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	40	40
Significant Other Observable Inputs (Level 2) \| Corporate notes and bonds
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	46,627
Significant Other Observable Inputs (Level 2) \| Municipal securities
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	2,996
Significant Unobservable Inputs (Level 3)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	0
Significant Unobservable Inputs (Level 3) \| Money market funds
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	0
Significant Unobservable Inputs (Level 3) \| Certificate of deposit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	0	$ 0
Significant Unobservable Inputs (Level 3) \| Corporate notes and bonds
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	0
Significant Unobservable Inputs (Level 3) \| Municipal securities
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total assets measured at fair value	$ 0